I need the dark yellow colour equivalent in ncs colour charts

It depends on what else you have in the room, the sofa colours etc. It looks to be a really nice room with some lovely features. Personally, I wouldn't paint it all a blue or a dark colour as East facing rooms can be gloomy on an afternoon. Have a look on instagram, there is a total shift away from dark interiors towards more neutral warmer ones. Not that this matters, but perhaps a year of lockdown has made a difference to what people want to live with.

I would class those cushions as more of a rust as opposed to orange. Could you swap them for a definite bright orange and also have curtains that have a large proportion of orange in? Walnut has undertones of orange so l think it would work well together.

Thank you all for helping as we were very stuck. So it seems that the Marley Dark Brown (4th from the left on the 1st picture) will work. It looks grey but according to the builder it is called brown🤷🏾‍♀️. We had thought the red old english marley 3rd from the left. Should I then have the sliding doors at the back of the house in white too? What colour front door? The back of the house will be rendered as will half of the front (first floor)? Thinking white render.